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NET LOSS PER SHARE ATTRIBUTABLE TO COMMON STOCK (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
NET LOSS PER SHARE ATTRIBUTABLE TO COMMON STOCK        
Net loss $ (11,589,000) $ (11,877,000) $ (20,189,000) $ (18,469,000)
Basic loss attributable to common stock (11,589,000) (11,877,000) (20,189,000) (18,469,000)
Diluted loss attributable to common stock $ (11,589,000) $ (11,877,000) $ (20,189,000) $ (18,469,000)
Weighted average common shares outstanding:        
Basic 21,605,262 21,525,952 21,593,317 19,783,724
Diluted 21,605,262 21,525,952 21,593,317 19,783,724
Basic loss attributable to a share of common stock $ (0.54) $ (0.55) $ (0.93) $ (0.93)
Diluted loss attributable to a share of common stock $ (0.54) $ (0.55) $ (0.93) $ (0.93)